Police have not identified the boy, but Diane Michele Keegan-Czajkowski posted on Facebook that her son, Nathaniel Czajkowski, had been killed in the shooting.

“Just know that my son was not in a gang and didn’t deal drugs,” she wrote. “The shooting appears to be a random act of violence.”

Friends who attended a vigil for Nathaniel on Sunday night said he had attended Doherty until this fall when he transferred to Coronado High School.

A Doherty High School senior, who asked not to be identified, said Nathaniel had been at the party where two males and a female were shot and severely injured around midnight before going to the Albertacos, 4494 Austin Bluffs Parkway, about 3 a.m.

The Doherty senior also had been at the Halloween costume party in the 3800 block of Soft Breeze Way thrown by a Coronado High School student where the earlier triple shooting took place.

Police said two males and one female were taken to local hospitals with gunshot wounds. Two were in critical and stable condition, while the other was in serious and stable condition, according to police, who did not identify the victims.

No arrests have been made in either shooting.

Sunday morning’s shootings come just over a month after a teenager was shot twice in a parking lot near Doherty High School a block away from Albertacos and less than two weeks after four shootings in a 24-hour span in Colorado Springs.

Denver is on track for one of its biggest elections in years as 66 candidates run for 15 elected positions in city government. But a few challengers have pulled away from the pack, a Denver Post analysis shows.